Mutual diffusion of asymmetric block copolymers with homopolymers

Macromolecules

Volumn 33, Issue 5, 2000, Pages 1871-1877

  Yokoyama, Hideaki ^a   Kramer, Edward J ^a  

^a UNIVERSITY OF CALIFORNIA   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ANNEALING; DIFFUSION IN SOLIDS; INTERFACES (MATERIALS); MOLECULAR WEIGHT; MULTILAYERS; PLASTIC FILMS; POLYSTYRENES; SECONDARY ION MASS SPECTROMETRY;

ASYMMETRIC BLOCK COPOLYMERS; MUTUAL DIFFUSION; POLYSTYRENE VINYLPYRIDINE;

BLOCK COPOLYMERS;

EID: 0033902723     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma990660s     Document Type: Article

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17. Note: The quantization of thickness occurs even in a sphere-forming diblock copolymer thin film. When the film thickness is intermediate (ca. 200-500 nm), the formation of islands and holes is supressed by surface tension and the internal structure of the layered film is slightly distorted. In a fairly thick film, ∼~1 μm, such distortions are absorbed by small strains of the internal structure and are too small to be detected experimentally. 13
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22. Note: The diffusion coefficient measured at a volume fraction of 0.5 occurs by a mechanism of activated hopping of individual block copolymer chains; therefore, the diffusion coefficient of whole micelles must be smaller than that. 6
23. Wet brush stands for a condition where a homopolymer penetrates into an adsorbed brush of diblock copolymer when the molecular weight of the homopolymer is smaller than that of the diblock copolymer. Dry brush describes the condition where a homopolymer does not penetrate into the adsorbed brush of block copolymer when the molecular weight of the homopolymer is larger than that of the diblock copolymer.
24. The bridging chains may include entangled loops, in which both chain ends reside in the same spherical domain, forming a loop, but the chain is topologically entangled with another loop. "Bridging" and "entangled loops" cannot be easily distinguished.